/* ioapi.c -- IO base function header for compress/uncompress .zip
files using zlib + zip or unzip API

Version 1.01e, February 12th, 2005

Copyright (C) 1998-2005 Gilles Vollant
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "zlib.h"
#include "ioapi.h"



/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */

#ifndef SEEK_CUR
#define SEEK_CUR    1
#endif

#ifndef SEEK_END
#define SEEK_END    2
#endif

#ifndef SEEK_SET
#define SEEK_SET    0
#endif

voidpf ZCALLBACK fopen_file_func OF((
                                    voidpf opaque,
                                    const char* filename,
                                    int mode));

uLong ZCALLBACK fread_file_func OF((
                                   voidpf opaque,
                                   voidpf stream,
                                   void* buf,
                                   uLong size));

uLong ZCALLBACK fwrite_file_func OF((
                                    voidpf opaque,
                                    voidpf stream,
                                    const void* buf,
                                    uLong size));

long ZCALLBACK ftell_file_func OF((
                                  voidpf opaque,
                                  voidpf stream));

long ZCALLBACK fseek_file_func OF((
                                  voidpf opaque,
                                  voidpf stream,
                                  uLong offset,
                                  int origin));

int ZCALLBACK fclose_file_func OF((
                                  voidpf opaque,
                                  voidpf stream));

int ZCALLBACK ferror_file_func OF((
                                  voidpf opaque,
                                  voidpf stream));


voidpf ZCALLBACK fopen_file_func (opaque, filename, mode)
voidpf opaque;
const char* filename;
int mode;
{
  FILE* file = NULL;
  const char* mode_fopen = NULL;
  if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
    mode_fopen = "rb";
  else
    if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
      mode_fopen = "r+b";
    else
      if (mode & ZLIB_FILEFUNC_MODE_CREATE)
        mode_fopen = "wb";

  if ((filename!=NULL) && (mode_fopen != NULL))
    file = fopen(filename, mode_fopen);
  return file;
}


uLong ZCALLBACK fread_file_func (opaque, stream, buf, size)
voidpf opaque;
voidpf stream;
void* buf;
uLong size;
{
  uLong ret;
  ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream);
  return ret;
}


uLong ZCALLBACK fwrite_file_func (opaque, stream, buf, size)
voidpf opaque;
voidpf stream;
const void* buf;
uLong size;
{
  uLong ret;
  ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream);
  return ret;
}

long ZCALLBACK ftell_file_func (opaque, stream)
voidpf opaque;
voidpf stream;
{
  long ret;
  ret = ftell((FILE *)stream);
  return ret;
}

long ZCALLBACK fseek_file_func (opaque, stream, offset, origin)
voidpf opaque;
voidpf stream;
uLong offset;
int origin;
{
  int fseek_origin=0;
  long ret;
  switch (origin)
  {
  case ZLIB_FILEFUNC_SEEK_CUR :
    fseek_origin = SEEK_CUR;
    break;
  case ZLIB_FILEFUNC_SEEK_END :
    fseek_origin = SEEK_END;
    break;
  case ZLIB_FILEFUNC_SEEK_SET :
    fseek_origin = SEEK_SET;
    break;
  default: return -1;
  }
  ret = 0;
  fseek((FILE *)stream, offset, fseek_origin);
  return ret;
}

int ZCALLBACK fclose_file_func (opaque, stream)
voidpf opaque;
voidpf stream;
{
  int ret;
  ret = fclose((FILE *)stream);
  return ret;
}

int ZCALLBACK ferror_file_func (opaque, stream)
voidpf opaque;
voidpf stream;
{
  int ret;
  ret = ferror((FILE *)stream);
  return ret;
}

void fill_fopen_filefunc (pzlib_filefunc_def)
zlib_filefunc_def* pzlib_filefunc_def;
{
  pzlib_filefunc_def->zopen_file = fopen_file_func;
  pzlib_filefunc_def->zread_file = fread_file_func;
  pzlib_filefunc_def->zwrite_file = fwrite_file_func;
  pzlib_filefunc_def->ztell_file = ftell_file_func;
  pzlib_filefunc_def->zseek_file = fseek_file_func;
  pzlib_filefunc_def->zclose_file = fclose_file_func;
  pzlib_filefunc_def->zerror_file = ferror_file_func;
  pzlib_filefunc_def->opaque = NULL;
}
